Rigidized 1-aryl sulfonyl tryptamines: Synthesis and pharmacological evaluation as 5-HT6 receptor ligands
摘要:
A series of N-1-arylsulfonyl-3-(pyrrolidin-3-yl)-1H-indole and N-1-arylsulfonyl-3-(4-chloro-2,5-dihydro-1H-pyrrol-3-yl)-1H-indole derivatives (tryptamine derivatives with rigidized side chain) have been prepared and tested for their binding affinity to 5-HT6 receptor. Several compounds displayed potent binding affinity for the 5-HT6 receptor when tested in in vitro binding assay. The primary SAR indicates that rigidification of dimethylamino alkyl chain at C-3 of indole carbon maintains the binding affinity to 5-HT6R. The lead compound N-1-benzenesulfonyl-3-(4-chloro-1-methyl-2,5-dihydro-1H-pyrrol-3-yl)-1H-indole, 10a (K-b = 0.1 nM) has shown excellent in vitro affinity and was active in animal models of cognition like NORT and water maze. (C) 2011 Elsevier Ltd. All rights reserved.